ZONOS2 Technical Report

The ZONOS2 8B TTS model has been released, featuring an increase in scale from 1.6B to 8B parameters, utilizing a mixture-of-experts (MoE) architecture to enhance inference latency and throughput. The training dataset has been expanded from 200K to over 6M hours, and the model demonstrates competitive performance on quality, speaker similarity, and a new TTS benchmark, ZTTS1-Eval, while maintaining efficient streaming capabilities. This release provides practitioners with improved voice cloning fidelity and naturalness, along with accessible model weights and inference code under an Apache 2.0 license.